WordReference Random House Unabridged Dictionary of American English © 2025
red′ line′, [Ice Hockey.]
red•line (v. red′līn′;n. red′līn′),USA pronunciation v., -lined, -lin•ing, n.
v.t.
v.i.
n.
red′lin′er, n.
- Sporta line of the color red that is parallel to and equidistant from the goal lines and divides the rink in half.
- 1960–65
red•line (v. red′līn′;n. red′līn′),USA pronunciation v., -lined, -lin•ing, n.
v.t.
- to treat by redlining (an area or neighborhood).
- to establish the recommended safe speed of (an airplane):The bomber is redlined at 650 miles an hour.
- to draw a canceling red line through (an item on a list).
- to mark or designate for cancellation, rejection, dismissal, or the like:club members redlined for unpaid dues.
- Aeronauticsto cause (an airplane) to be grounded.
v.i.
- to engage in redlining.
n.
- Automotive
- the maximum rotational speed, or angular velocity, of the engine crankshaft that is considered safe: often measured in rpm.
- a red line or boundary of a red area that delineates such a value, as on a tachometer.
- red1 + line1 1940–45